It seems that some people have been saying that the newest magisk 13.3 isn’t working but it is for me. I am using drax rom and got clean root install through autoroot tool and then updated magisk by first getting newest manager and doing it through there

I downloaded the very latest Magisk from git ( https://github.com/kantjer/MagiskFiles ) version 13.3-170812-zip & then removed the Magisk App-booted into recovery-flashed the Remove-Magisk zip-cleared cache-rebooted into recovery-flashed the new version & NOW I have Magisk working properly.